Which organ contains the cardiac muscle heart or bladder i need to no now

The heart.

Explanation:

"Cardiac" pertains to the heart. The heart is an organ that contains cardiac muscles (also called myocardium). Cardiac muscle is an involuntary striated type of muscle. The bladder is made up of smooth muscles, which are involuntary non-striated muscles.

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the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.